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举一反三
- [imgwidth="284"height="42"title=""style=...space="0"hspace="0">
- [imgwidth="375"height="34"title=""style=...space="0"hspace="0">
- [imgwidth="443"height="55"title=""style=...space="0"hspace="0">
- 设，>0，则必定存在一个正数δ，使得[imgwidth="69"height="...4dc61805f98123.png"]
- 设，则在点处取得极大值[imgwidth="140"height="46"src...45a93112d66125.png"]